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#include <Interpreters/DirectJoin.h>
#include <Interpreters/castColumn.h>
#include <Columns/ColumnNullable.h>
#include <Common/logger_useful.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
extern const int NOT_IMPLEMENTED;
extern const int UNSUPPORTED_JOIN_KEYS;
extern const int NOT_FOUND_COLUMN_IN_BLOCK;
}
static Block originalRightBlock(const Block & block, const TableJoin & table_join)
{
Block original_right_block;
for (const auto & col : block)
original_right_block.insert({col.column, col.type, table_join.getOriginalName(col.name)});
return original_right_block;
}
/// Converts `columns` from `source_sample_block` structure to `result_sample_block`.
/// Can select subset of columns and change types.
static MutableColumns convertBlockStructure(
const Block & source_sample_block, const Block & result_sample_block, MutableColumns && columns, const PaddedPODArray<UInt8> & null_map)
{
MutableColumns result_columns;
for (const auto & out_sample_col : result_sample_block)
{
/// Some columns from result_sample_block may not be in source_sample_block,
/// e.g. if they will be calculated later based on joined columns
if (!source_sample_block.has(out_sample_col.name))
continue;
auto i = source_sample_block.getPositionByName(out_sample_col.name);
if (columns[i] == nullptr)
{
throw DB::Exception(ErrorCodes::NOT_FOUND_COLUMN_IN_BLOCK, "Can't find column '{}'", out_sample_col.name);
}
ColumnWithTypeAndName col = source_sample_block.getByPosition(i);
if (!col.type->equals(*out_sample_col.type))
{
col.column = std::move(columns[i]);
result_columns.push_back(IColumn::mutate(castColumnAccurate(col, out_sample_col.type)));
}
else
{
result_columns.push_back(std::move(columns[i]));
}
columns[i] = nullptr;
if (result_columns.back()->isNullable())
{
assert_cast<ColumnNullable *>(result_columns.back().get())->applyNegatedNullMap(null_map);
}
}
return result_columns;
}
DirectKeyValueJoin::DirectKeyValueJoin(std::shared_ptr<TableJoin> table_join_,
const Block & right_sample_block_,
std::shared_ptr<const IKeyValueEntity> storage_)
: table_join(table_join_)
, storage(storage_)
, right_sample_block(right_sample_block_)
, log(&Poco::Logger::get("DirectKeyValueJoin"))
{
if (!table_join->oneDisjunct() ||
table_join->getOnlyClause().key_names_left.size() != 1 ||
table_join->getOnlyClause().key_names_right.size() != 1)
{
throw DB::Exception(ErrorCodes::UNSUPPORTED_JOIN_KEYS, "Not supported by direct JOIN");
}
bool allowed_inner = isInner(table_join->kind()) && (table_join->strictness() == JoinStrictness::All ||
table_join->strictness() == JoinStrictness::Any ||
table_join->strictness() != JoinStrictness::RightAny);
bool allowed_left = isLeft(table_join->kind()) && (table_join->strictness() == JoinStrictness::Any ||
table_join->strictness() == JoinStrictness::All ||
table_join->strictness() == JoinStrictness::Semi ||
table_join->strictness() == JoinStrictness::Anti);
if (!allowed_inner && !allowed_left)
{
throw DB::Exception(ErrorCodes::NOT_IMPLEMENTED, "Strictness {} and kind {} is not supported by direct JOIN",
table_join->strictness(), table_join->kind());
}
LOG_TRACE(log, "Using direct join");
}
DirectKeyValueJoin::DirectKeyValueJoin(
std::shared_ptr<TableJoin> table_join_,
const Block & right_sample_block_,
std::shared_ptr<const IKeyValueEntity> storage_,
const Block & right_sample_block_with_storage_column_names_)
: DirectKeyValueJoin(table_join_, right_sample_block_, storage_)
{
right_sample_block_with_storage_column_names = right_sample_block_with_storage_column_names_;
}
bool DirectKeyValueJoin::addBlockToJoin(const Block &, bool)
{
throw DB::Exception(ErrorCodes::LOGICAL_ERROR, "Unreachable code reached");
}
void DirectKeyValueJoin::checkTypesOfKeys(const Block & block) const
{
for (const auto & onexpr : table_join->getClauses())
{
JoinCommon::checkTypesOfKeys(block, onexpr.key_names_left, right_sample_block, onexpr.key_names_right);
}
}
void DirectKeyValueJoin::joinBlock(Block & block, std::shared_ptr<ExtraBlock> &)
{
const String & key_name = table_join->getOnlyClause().key_names_left[0];
const ColumnWithTypeAndName & key_col = block.getByName(key_name);
if (!key_col.column)
return;
Block original_right_block = originalRightBlock(right_sample_block, *table_join);
Block right_block_to_use = right_sample_block_with_storage_column_names ? right_sample_block_with_storage_column_names : original_right_block;
const Names & attribute_names = right_block_to_use.getNames();
NullMap null_map;
Chunk joined_chunk = storage->getByKeys({key_col}, null_map, attribute_names);
/// Expected right block may differ from structure in storage, because of `join_use_nulls` or we just select not all joined attributes
Block sample_storage_block = storage->getSampleBlock(attribute_names);
MutableColumns result_columns = convertBlockStructure(sample_storage_block, right_block_to_use, joined_chunk.mutateColumns(), null_map);
for (size_t i = 0; i < result_columns.size(); ++i)
{
ColumnWithTypeAndName col = right_sample_block.getByPosition(i);
col.column = std::move(result_columns[i]);
block.insert(std::move(col));
}
bool is_semi_join = table_join->strictness() == JoinStrictness::Semi;
bool is_anti_join = table_join->strictness() == JoinStrictness::Anti;
if (is_anti_join)
{
/// invert null_map
for (auto & val : null_map)
val = !val;
}
/// Filter non joined rows
if (isInner(table_join->kind()) || (isLeft(table_join->kind()) && (is_semi_join || is_anti_join)))
{
MutableColumns dst_columns = block.mutateColumns();
for (auto & col : dst_columns)
{
col = IColumn::mutate(col->filter(null_map, -1));
}
block.setColumns(std::move(dst_columns));
}
}
}
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